Parkes observations for project P1032 semester 2025APRS_04

With this proposal, we aim to continue P1032, the rapid measurements of relativistic parameters of southern binary pulsar systems using data from the Parkes Ultra Wideband Low (UWL) receiver. As the MeerTime project at the MeerKAT radio telescope ended in early 2024, observations with the UWL receiver now form the backbone for extending the timing baselines of many pulsars that have been part of this project. Since the source selection in APRS2024 was tailored such that the UWL receiver is the most (versatile and) suited instrument to achieve the proposed scientific goals for the chosen pulsars, we propose to continue these observations. We will use the UWL data to obtain significant orbital coverage and timing baselines on these pulsars and obtain important constraints on orbital and temporal DM variations that will help in identifying the nature of the companion stars. Increasing the number of measured Neutron Star (NS) masses, as well as improving on current constraints has profound implications for NS internal structure and for stellar and binary evolution physics. We request pre-graded status for this project for the next semester.本提案旨在延续P1032项目，即利用帕克斯（Parkes）超宽带低（UWL）接收机的观测数据，快速测量南天双星脉冲星系统的相对论性参数。随着梅尔卡特（MeerKAT）射电望远镜的MeerTime项目于2024年初收官，依托UWL接收机开展的观测现已成为拓展该项目中多颗脉冲星计时基线的核心支撑。鉴于APRS2024中的源选取方案已适配为：UWL接收机是实现选定脉冲星科学目标的最优且最通用的仪器，因此我们提议延续此类观测。我们将利用UWL接收机数据，对这批脉冲星实现充分的轨道覆盖与计时基线测量，并获取轨道与时域色散量（Dispersion Measure，DM）变化的重要约束，这将有助于厘清伴星的本质。增加中子星（Neutron Star, NS）质量的测量样本数量，同时优化现有约束结果，对中子星内部结构研究以及恒星与双星演化物理均具有深远意义。我们恳请为本项目在下一学期获得预调度观测资格。